Former Secretary of State Hillary Clinton continues to demolish her potential 2016 Democratic primary competitors, while the GOP field is significantly tighter, according to a poll released Tuesday.

Florida Sen. Marco Rubio, who is playing a leading but risky role in shaping a comprehensive immigration reform overhaul, has 18 percent of the Republican primary vote, according to a Fairleigh Dickinson University poll out Tuesday. New Jersey Gov. Chris Christie, whose occasional praise of the Obama administration has alienated the right, is in second with 16 percent. Former Florida Gov. Jeb Bush, who Republicans worry will be dragged down by his famous name, is in third with 14 percent.

Former Pennsylvania Sen. Rick Santorum gets a mere 9 percent. Twenty-one percent of Republicans would pick another candidate and another 21 percent are undecided.

The poll also found that Republicans who watch late-night comedy programs like “The Daily Show” are likely to pick Christie, who earns 30 percent of their vote. Talk radio listeners are more likely to back Rubio (19 percent) or Bush (17 percent). Fortunately for the Floridians, talk radio listeners outnumber comedy watchers more than four-to-one among the GOP.

A whopping 63 percent of Democratic primary voters are backing Clinton at this point, compared with 12 percent for Vice President Joe Biden and 3 percent for New York Gov. Andrew Cuomo. Ten percent are unsure and 12 percent would back another candidate.

The poll of 863 registered voters was conducted April 22 through April 28. It has a margin of error of plus or minus 3.4 percentage points.